Be patient, you haven't run for that long. It's not easy for someone new to 1500 meter training to convert 51. 400 speed, 58 per 400 in the 800 to averaging 62 per 400 in the mile. You probably lack the endurance necessary to hit your 4:08 in the near future.
However you received some good long term programs to get you there if you remain patient.
You could do it, good luck.